Microcomputer Protection Relay Setting (微机保护整定)

Overload / instantaneous / earth-fault pickup settings and inverse-time curve trip time for line, transformer, motor and capacitor protection.

Protected equipment Equipment rated current Ir (A) CT ratio (primary / secondary, e.g. 300 / 5)

Overload pickup I> (× Ir)

Instantaneous I>> (× Ir)

Time dial / multiplier TMS Inverse-time curve Fault current multiple M (× overload pickup)